There are various methods of repairing a punctured tyre, with numerous accompanying products to enable those repairs.
By far the three most common tyre puncture repair methods are;
However, only a tyre repair using a combination tyre repair patch and plug (also known as a combi repair or mushroom repair) is regarded as Industry best practice, as this is the only one to seal the tyre throughout the entire damaged area.
As for the actual repair procedure, there is only one that is accepted by British Standard Institution. This tyre repair procedure is known as BS AU 159 and sets out the "specification for repairs to tyres for motor vehicles used on the public highway".
Remove the tyre from the wheel and have a tyre expert thoroughly inspect it both internally and externally. If any serious tyre damage is present, then the repair should not continue.
Locate and mark the damage, taking out any foreign object still puncturing the tyre.
Prepare the puncture channel from the tyre inside of the tyre using a 6mm carbide mill cutter.
Repeat the process, now from the outside of the tyre inwards, ensuring once finished the channel feels resistance free on the mill cutter.
Thoroughly clean an area 10mm to 20mm larger than the repair patch using a specific pre-buff cleaner and repair scraper. Make sure to remove all residues such mould releasing agents.
Hold the patch in position and mark its outline on the inner liner.
Buff the inner liner to roughly 5mm beyond the marked area using an appropriate domed buffing rasp. Make sure that any raised ribs are left flat after buffing, leaving suede finish.
Remove dust and extraneous material including wire particles, buffed rubber and fluffed cords.
Apply a specialist vulcanising accelerator solution to the puncture channel and buffed area.
Insert the combination tyre repair patch and plug into the puncture channel.
Pull the combination tyre repair patch and plug outwards until the entire patch is flush with the inside of the tyre.
Roll the reverse of the patch using a corrugated tyre stitcher. Roll from the centre of the patch outwards to remove any air bubbles, making sure the entire patch has solid contact with the buffed inner liner.
Seal the combination tyre repair patch and plug base and buffed area still exposed with an inner liner sealant.
Cut the stem of the combination tyre repair patch and plug flush with the remaining tread of the tyre, after first mounting the tyre back onto the wheel and reinflating to the correct pressure.
|Repairable Percentage Area (‘Area T’) based on Nominal Section Width|
|Up to and including 155mm||60%|
|Between 155mm and 200mm||65%|
Nominal section width = 205mm
70% of this width = 144mm
This tyre is repairable within 72mm of either side of the tyre centre line.
NOTE: All the information on this page is relevant to what is considered a minor repair to a radial construction tyre fitted to a car and van. This information is not relevant to commercial vehicles, heavy plant or industrial vehicles. Major repairs such a repairs to sidewall damage are also governed by the same British standard but will need to be sent away to a specialist major repairer.